import sys
input = sys.stdin.readline

nums = [int(input()) for _ in range(int(input()))]
num_max = max(nums)

isPrime = [True for _ in range(num_max+1)]
isPrime[0], isPrime[1] = False, False
for i in range(2,int(num_max**0.5)+1) :
    if isPrime[i] :
        for j in range(i*i, num_max+1, i) :
            isPrime[j] = False

result = []
for n in nums :
    count = 0
    for i in range(2,n//2 + 1) :
        if isPrime[n-i] and isPrime[i] :
            count += 1
    result.append(str(count))

print('\n'.join(result))